Abstract
Madinahustium acaciaum gen. nov., sp. nov. (Acari: Erythraeidae: Balaustiinae) is described and illustrated from larvae, collected from Acacia sp. (Fabaceae) from Al-Madinah, Saudi Arabia. It is the second species of the subfamily Balaustiinae Grandjean after Balaustium yousifi Kamran and Alatawi from the country. A key to the larval genera of the subfamily Balaustinae Grandjean is provided.